HP 48gII - Manual (Page 407)

Page 12-26
if in RPN mode). Then, press @ERASE @DRAW. Press @CANCL to return to the PLOT,
PLOT WINDOW, or PLOT SETUP screen. Press $, or L@@@OK@@@, to return
to normal calculator display.
Generating a table for parametric equations
In an earlier example we generated a table of values (X,Y) for an expression
of the form Y=f(X), i.e., a Function type of graph. In this section, we present
the procedure for generating a table corresponding to a parametric plot. For
this purpose, we’ll take advantage of the parametric equations defined in the
example above.
• First, let’s access the TABLE SETUP window by pressing „õ,
simultaneously if in RPN mode. For the independent variable change
the
Start ing value to 0.0, and the Step value to 0.1. Press @@@OK@@@.
• Generate the table by pressing, simultaneously if in RPN mode,
„ö. The resulting table has three columns representing the
parameter t, and the coordinates of the corresponding points. For
this table the coordinates are labeled X1 and Y1.
• Use the arrow keys, š™—˜, to move about the table.
• Press $ to return to normal calculator display.
This procedure for creating a table corresponding to the current type of plot
can be applied to other plot types.
Plotting the solution to simple differential equations
The plot of a simple differential equation can be obtained by selecting Diff
Eq in the TYPE field of the PLOT SETUP environment as follows: suppose that
we want to plot x(t) from the differential equation dx/dt = exp(-t
2 ), with initial
conditions: x = 0 at t = 0. The calculator allows for the plotting of the solution